Heat exchanger arrangement in a housing

ABSTRACT

A heat exchanger arrangement in a housing, such as an intake pipe of an internal combustion engine, has at least one stack including tubes and fins and an end plate having media connections, and wherein the stack is inserted into the housing and is fastened therein. A connecting block which contains the media connections and/or at least one profiled rail is arranged on the end plate. The housing has at least one cross-section-expanding wall graduation and/or at least one receptacle integrated into the housing wall, wherein the connecting block sits in the cross-section expansion and/or a cross section of the receptacle corresponds approximately to a cross section of the rail.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority to German Patent Application No. 102013002478.1 filed Feb. 13, 2013 and German Patent Application No. 102013002523.0, filed Feb. 13, 2013, the entire contents of which are hereby incorporated by reference herein.

BACKGROUND

The invention relates to a heat exchanger arrangement in a housing, such as an intake pipe of an internal combustion engine, wherein the heat exchanger has at least one stack consisting of tubes and fins, and an end plate which can have fluid passages, and wherein the stack is inserted into the housing and is fastened therein.

Such a heat exchanger arrangement is revealed, for example, in EP 1 785 609 A1 and also in EP 1 830 048 A1. It involves indirect charge-air coolers with which the charge air, or else a mixture of charge air and an exhaust gas flow to be conducted back to the internal combustion engine, is cooled with a liquid coolant. In these references, the stack has an end plate projecting around and above the contour of the stack and is inserted into an opening in the housing from above. The fastening takes place at the opening edge of the housing and at the projecting edge of the end plate by means of screw connections or the like.

WO 2012/085008 A1 relates to a heat exchanger arrangement in a housing and has a stack of tubes and fins, as do many other publications too, but, instead of an end plate, a tube plate, in the openings of which tube ends are accommodated.

SUMMARY

It is an object of the invention to provide an alternative arrangement which is better suited to specific applications having high mechanical loads.

Some embodiments dispense entirely with a fastening edge, which projects over the entire circumference, on the end plate. The end plate can be designed to be somewhat smaller and lighter with regard to the thickness thereof and the surface extent thereof than in the prior art referred to in the introduction, also because said end plate has to absorb smaller forces since the latter are better distributed.

Some embodiments also provide a projecting edge on the end plate, said edge can also be designed to be smaller and therefore only a partial edge, i.e. not an encircling edge.

A certain fixing of the heat exchanger in the housing and thus a better force distribution can be achieved according to the invention in that a connecting block, which is arranged on the end plate of the stack, for a coolant sits in a housing wall graduation formed in a manner corresponding to a cross section of the connecting block. The at least one wall graduation provides a cross-sectional expansion of the housing. The connecting block is accommodated in the housing space additionally created by the wall graduation. The connecting block extends the fluid apertures in the end plate. It therefore likewise has fluid apertures.

Additional means of fixing the heat exchanger in the housing and therefore an even better force distribution can be provided by profiled rails or the like arranged on the stack or around the stack being fastened, said rails being pushable into further receptacles which are formed on the housing wall and the cross section of which corresponds approximately to the cross section of the rails. The rails can also be provided in the manner of a frame, around the circumference of the stack.

The push-in direction lies approximately transversally with respect to the longitudinal direction of the stack and in the direction of a fluid flow which flows through the fins of the stack in the operating state of the arrangement. A liquid coolant then flows through the pipes of the stack.

The stability of the arrangement is once again substantially increased by the rails sitting in the receptacles. If the housing is a plastic housing which could deform in the event of an appropriate pressure, such a design is particularly important in order to inhibit such deformation.

According to some embodiments of the invention, at least one profiled rail is arranged on the end plate of the stack, and sits in a receptacle which is integrated in a housing wall, wherein a cross section of the receptacle corresponds approximately to a cross section of the rail to provide a particularly stable structure. This structure has a better effect against vibrations and other mechanical loads and, furthermore, is also suitable for avoiding bypass flows between the stack and the housing wall.

In some embodiments, the receptacles are integrated in housing walls of the housing in such a manner that the inside of the housing walls remains approximately flat and the outside of the housing walls has a curvature. This can result in substantially smooth contact between the flat inside and the flat end plate.

The entire length of the rail can be positioned in the receptacle, which likewise has a corresponding length.

In particular, if the application requires the use of a heat exchanger arrangement in a housing having an exceptional overall size, or else replaces a plurality of smaller heat exchanger arrangements and, as a result, is intended to save costs, even greater attention is focused on the stability of the design. This aspect is complied with best by means of the invention.

The invention is described below in an exemplary embodiment which is depicted in the drawings. The description contains further possibly important details of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a heat exchanger arrangement according to some embodiments of the present invention.

FIG. 2 is an exploded view of part of FIG. 1.

FIG. 3 shows the heat exchanger in an intake pipe.

FIG. 4 shows an enlarged detail from FIG. 3.

FIG. 5 is a perspective view of a heat exchanger according to some aspects of the present invention.

FIG. 6 is a side view of a portion of the embodiment illustrated in FIG. 5.

FIG. 7 is a top view of the portion of the embodiment shown in FIG. 6.

FIG. 8 is a perspective view of the portion of the embodiment shown in FIGS. 6-7.

FIG. 9 is an exploded perspective view of a heat exchanger according to some aspects of the present invention.

FIG. 10 is a side view of a portion of the embodiment illustrated in FIG. 9.

FIG. 11 is a cross-sectional view taken along line A-A of FIG. 10.

FIG. 12 is a perspective view of a heat exchanger according to some aspects of the present invention.

FIG. 13 is a perspective view of a portion of the embodiment shown in FIG. 12.

FIG. 14 is a perspective view of a portion of a heat exchanger according to some embodiments of the present invention.

FIG. 15 is a perspective view of a heat exchanger according to some embodiments of the present invention.

FIG. 16 is a perspective view of a portion of the heat exchanger of FIG. 15.

FIG. 17 is a side view of a portion of a heat exchanger according to some embodiments of the present invention.

FIG. 18 is a perspective view of the portion of the heat exchanger shown in FIG. 17.

FIG. 19 is a cross-sectional view of the heat exchanger of FIGS. 17-18 positioned in a housing.

DETAILED DESCRIPTION

In the exemplary embodiments, heat exchanger arrangements are shown and described in an intake pipe 10, which constitutes a housing 10, of an internal combustion engine, wherein the heat exchanger is an indirect charge-air cooler and/or exhaust-gas recirculation cooler. It is therefore possible for “housing” also to be placed at all of the points at which the intake pipe is mentioned in the following text, and this is also true for the situation the other way around.

However, the invention is actually not restricted to such a specific application. The present invention can be used for numerous other applications, in particular those which carry out an exchange of heat between a gas and a liquid, such as, for example, heating heat exchangers, heat exchangers for air conditioning, etc.

However, the present invention is also not intended to be restricted thereto, since, for example, oil coolers which are operated with a liquid coolant also constitute a conceivable application, wherein the tubes, and/or the fins of the stack, are to be appropriately adapted in respect of the cross-sectional dimensioning thereof by a person skilled in the art.

The stack 1 forming the heat exchanger consists of flat tubes 2 and fins 3, for example corrugated fins, arranged in an alternating manner. The illustrated flat tubes 2 are each formed from two deformed and connected plates. However, for example, drawn flat tubes 2 are also the most highly suitable (FIG. 11).

Two parallel ducts, an inflow duct 20 and an outflow duct 21 extend vertically through the stack 1. The two ducts 20, 21 (FIG. 2) are formed from two openings in the wide sides of the flat tubes 2, said openings being streamlined with each other in the stack 1. The openings mentioned can have collar-like borders 25 (for example FIGS. 5 and 17). A collar-like border 25 in the wide sides of the one flat tube 2 is connected in a fluid-tight manner to just such a collar-like border 25 in the wide sides of the adjacent flat tube 2, etc. In the stack 1, the connected collar-like borders 25 span the height of the intermediate spaces, which are filled with the corrugated fins 3, between the flat tubes 2 and therefore ensure the separation between compressed charge air LL which is to be cooled and which flows through the corrugated fins 2, and a liquid coolant which can flow into the flat tubes 2 via the inflow duct 20 and via the connected collar-like borders 25 and can flow out in the same manner via the outflow duct 21. The flat tubes 2 have a flow separation 24 which lies between the ducts 20, 21 and runs in the longitudinal direction of the flat tubes 2 (FIG. 11) and ends shortly before the other end of the flat tubes 2, and therefore, in the exemplary embodiment, the flow passes in a U-shaped manner through all of the flat tubes 2, which is indicated in FIG. 3.

An end plate 4 is located on top of the stack 1. On the end plate 4, at one end thereof, which end corresponds approximately also to the one end of the flat tubes 2, there is a connecting block 5 which can be brazed on the end plate, so that the entire stack 1 preferably constitutes a brazed structure. In the exemplary embodiments, the connecting block 5 sits exactly over the described ducts 20, 21. The fluid apertures or media connecting ducts formed in the connecting block 5 are fluidly connected to the fluid apertures in the end plate 4 and the ducts 20, 21 of the heat exchanger. The ducts 20, 21 of the heat exchanger are formed by means of the streamlined openings in the wide sides of the flat tubes 2 (see above). The connecting block 5 in the exemplary embodiment extends transversely over the entire depth of the stack 1.

The illustrated intake pipe 10 is a plastic intake pipe which, in the exemplary embodiments includes three parts 10.1, 10.2, 10.3 (FIG. 1). The intake pipe 10 is produced in the form of an injection molded product. The first part 10.1 has a connector 14 for the entering hot air or charge air LL and that intake pipe section which forms the direct housing 10 for the heat exchanger stack 1. The first part 10.1 can be considered to be a main part. In the exemplary embodiment, the air connector 14 is arranged laterally. The cross section thereof is expanded toward four intake pipe sides, wherein the shape of said illustrated connector merges from approximately round into approximately rectangular.

A two-part configuration has been provided, with four outlet openings in the exemplary embodiment, on the outlet side of the intake pipe 10 for cold air, said outlet side facing the internal combustion engine (not shown). Each outlet opening is assigned to a cylinder of the internal combustion engine. The second part 10.2 has a connecting flange in order to connect to the first part 10.1, for example by means of hot gas welding, after the stack has been installed in the main part, which has just such a connecting flange. The third part 10.3 completes the intake pipe 10 and can be connected to the second part 10.2 likewise by means of hot gas welding.

As FIG. 1 shows particularly clearly, the main part 10.1 of the intake pipe 10 or of the housing has a wall graduation 11 which significantly expands the cross section of the intake pipe 10. The expanded cross section, which is adjacent in the exemplary embodiment to a corner region of the intake pipe 10, is of such a size that the connecting block 5 can sit exactly therein. The cross-section expansion 11 or the wall graduation therefore extends into the intake pipe 10 over a depth which corresponds approximately to the depth of the stack 1 in order to be able completely to accommodate the connecting block 5 located on the end plate 4 in said intake pipe.

Connecting openings 22, 23 which approximately correspond to the fluid apertures in the connecting block 5 are arranged in the cross-section-expanding wall graduation 11 (see FIG. 3).

Other openings are also located in the connecting block 5 and in the wall graduation 11 for fastening purposes. A seal 50 can also be present between the upper side of the connecting block 5 and the inside of the intake pipe 10, in the cross-section-expanding region. For the fastening, for example, screws can be guided through the openings into the connecting block 5. The inside of the intake pipe 10 here is pressed fixedly on to the seal 50. Furthermore, a particularly high degree of stability of the heat exchanger arrangement in the plastic intake pipe is achieved in interaction with rails 6 and receptacles 7, which are described further below.

As is furthermore apparent from FIG. 2, the end plate 4 has, on the side of the connecting block 5, a projecting length 40 over the stack 1, said projecting length, together with an edge piece of the connecting block 5, engaging in a channel 13 formed in the intake pipe wall. This projecting length 40 could optionally also be omitted. In some embodiments, it suffices for the connecting block 5 alone to have a projecting length. The channel 13 is arranged directly adjacent to the wall graduation 11 and is similar thereto. In this exemplary embodiment, the channel 13 forms, together with the wall graduation 11, the cross-section expansion mentioned in a corner region of the intake pipe 10 and also enlarges said cross-section expansion considerably.

In embodiments which are not shown, the wall graduation 11 with the cross-section expansion is located a good distance away from a corner region.

The end plate 4 has, at the end thereof opposite the connecting block 5, a further projecting length 40 over the stack 1, said projecting length engaging in another channel 12 formed in the opposite intake pipe wall (FIGS. 2 and 3).

As the figures show, the two channels 12, 13 are formed similarly to the wall graduation 11. The wall graduation 11 is arranged in a longitudinal wall of the intake pipe 10 or of the main part 10.1 of the intake pipe, and the channels 12, 13 are located in opposite transverse walls of the main part 10.1.

A further end plate 4 can be located opposite the described end plate 4—on the lower side of the stack in the illustrations, which further end plate can be designed to be significantly weaker than the described end plate 4, since said further end plate is not necessary per se for force absorption and distributing forces. Accordingly, the further end plate can also be omitted.

The profiled rails 6 are fastened to the stack 1 at the top and optionally the bottom, i.e. to the end plates 4 of the stack 1, said rails sitting approximately over an entire length L thereof in receptacles 7 which are formed in the intake pipe 10 and the cross section of which corresponds approximately to the cross section of the rails 6. In this exemplary embodiment, the length L of the rail 6 approximately corresponds to the depth of the stack 1. The length could readily also be shorter or the length could also be somewhat longer. The rails 6 can be brazed individually onto the stack 1 and oriented in the longitudinal direction or transverse direction of the stack 1. The cross sections shown are, for example, I-shaped or L-shaped. In the exemplary embodiments, the two limbs of the I-shaped profile differ in length. The longer limb lies on the end plate 4.

FIGS. 1-4 show only a single rail 6.

FIGS. 5-8 show two rails 6, one on the upper end plate 4 and another on the lower end plate 4, and corresponding receptacles 7 in the adjacent intake pipe walls. The rail 6 sits approximately over the entire length L thereof in the receptacle 7.

In the embodiments with I profiles, the rails 6 are arranged in the push-in direction of the stack into the intake pipe 10, the transverse direction of the stack 1 in the exemplary embodiment. The L-shaped profile can be arranged, by contrast, in the longitudinal direction of the stack 1, i.e. transversely with respect to the push-in direction, in the exemplary embodiments according to FIGS. 17-19.

It is also possible to form a four-cornered frame 60 from the described rails 6 and from non-profiled rails, said frame being pushed over the circumference of the brazed stack 1 without being specially fastened thereto (FIGS. 9-13). In these cases, the rails can also be composed of a different material, possibly also from plastic. The use of other heat-resistant materials is also conceivable.

FIGS. 12-14 show exemplary embodiments having two frames 60, which are distinguished by particularly high stability.

The receptacles 7 have been designed to be integrated in the walls, specifically in such a manner that, when the rails 6 sit in the receptacles 7, there are no gaps, through which power-reducing bypasses could flow, between the stack 1 or between the end plates 4 thereof and the housing walls, which is very clearly shown by FIGS. 3-5, for example. The receptacles 7 have been integrated in such a manner that the intake pipe wall remains flat on the inside, which serves to avoid bypasses. The necessary space for the receptacles 7 then leads outwards to a corresponding curvature 70 of the wall. (For example, FIGS. 2, 3 and 5).

A further advantage of the use of the described rails 6 over other known solutions consists in that the standard elements of the stack 1, i.e. the fins 3 and the tubes 2, do not have to be changed, which simplifies the production thereof. The separation of the flow 24 in the flat tubes 2 as discussed above can also be seen in FIG. 11.

The hot gas welding connection to the connecting flanges of the main part and of the second part, which hot gas welding connection has already been discussed by way of example, then takes place, after the described installation of the stack in the main part is finished.

Various features and advantages of the invention are set forth in the following claims. 

What is claimed is:
 1. Heat exchanger assembly comprising: a housing having at least one cross-section-expanding wall graduation; at least one stack including tubes and fins positioned within the housing; an end plate connected to the stack and having fluid passages; and a connecting block positioned on the end plate and fluidly connected to the fluid passages, wherein the connecting block is accommodated in the wall graduation.
 2. Heat exchanger arrangement according to claim 1, wherein the wall graduation includes connecting openings which approximately correspond to the fluid openings in the connecting block.
 3. Heat exchanger arrangement according to claim 2, wherein the connecting block and the wall graduation define further openings for fastening purposes.
 4. Heat exchanger arrangement according to claim 1, further comprising profiled rails that are arranged on the stack, wherein the housing including a housing wall that defines receptacles, the rails each extending approximately over the entire length of the stack, wherein the rails are inserted into the receptacles, and wherein the cross section of said receptacles substantially corresponds to the cross section of the rails.
 5. Heat exchanger arrangement according to claim 4, wherein the receptacles are integrally formed in the housing wall, such that an inside of the housing wall remains substantially planar.
 6. Heat exchanger arrangement according to claim 1, characterized in that the housing includes multiple parts.
 7. Heat exchanger arrangement according to claim 4, wherein the housing defines the wall graduation and the receptacles.
 8. Heat exchanger arrangement according to claim 4, further comprising a projecting length positioned on the end plate at an end opposite the connecting block, wherein the projecting length engages in a channel formed in the housing wall.
 9. Heat exchanger arrangement according to claim 8, further comprising a second projecting length positioned on the end plate over the stack on the side of the connecting block, the projecting length and an edge piece of the connecting block engage a second channel formed in the housing wall.
 10. Heat exchanger arrangement according to claim 9, wherein the channel and the second channel are formed in a similar manner to the wall graduation, wherein the wall graduation is arranged in a longitudinal wall of the housing and the channel and the second channel are arranged in opposite transverse walls of the housing.
 11. Heat exchanger arrangement according to claim 9, wherein the second channel and the wall graduation are arranged adjacent to each other and together constitute the cross-section expansion of the housing.
 12. Heat exchanger arrangement according to claim 9, wherein the channel and the second channel and the wall graduation are arranged away from each other.
 13. Heat exchanger arrangement comprising: a housing having a housing wall that defines a receptacle; at least one stack including tubes and fins, the stack being inserted into the housing; an end plate positioned on the stack; and at least one profiled rail arranged on the end plate, the rail defining a length, wherein approximately the entire length of the rail is received in the receptacle, wherein a cross section of the receptacle substantially corresponds to a cross section of the rail.
 14. Heat exchanger arrangement according to claim 13, wherein the receptacle and the profiled rail are designed such that there is no substantial air gap between the end plate and an inside of the housing wall.
 15. Heat exchanger arrangement according to claim 13, wherein the at least one rail includes a first rail formed on a first side of the stack and a second rail formed on a second side of the stack opposite the first side, and wherein the receptacle is formed on a first side of the housing corresponding to the first side of the stack and wherein a second receptacle is formed on a second side of the housing corresponding to the second side of the stack.
 16. Heat exchanger arrangement according to claim 15, wherein the receptacles are integrally formed in the opposite housing walls such that the inside of the housing walls remains approximately flat and the outside of the housing walls has a curvature.
 17. Heat exchanger arrangement according to claim 13, further comprising a frame extending around a circumference of the stack, wherein the profiled rails are integrally formed with the frame.
 18. Heat exchanger arrangement according to the claim 13, wherein a connecting block is arranged on the end plate, wherein the housing has at least one cross-section-expanding wall graduation, and wherein the connecting block is accommodated in the wall graduation.
 19. Heat exchanger arrangement according to claim 18, wherein the connecting block and the wall graduation define openings for fastening purposes.
 20. Heat exchanger arrangement according to claim 13, wherein the housing includes multiple parts.
 21. Heat exchanger arrangement according to claim 18, wherein the housing defines the wall graduation and the receptacles.
 22. Heat exchanger arrangement according to claim 18, wherein the end plate includes a projecting length over the stack and positioned at the end opposite the connecting block, wherein the projecting length engages a channel formed in the housing wall.
 23. Heat exchanger arrangement according to claim 22, wherein the end plate also includes a second projecting length over the stack on the side of the connecting block, wherein the projecting length and an edge piece of the connecting block engage a second channel formed in the housing wall.
 24. Heat exchanger arrangement according to claim 23, wherein the channel and the second channel are formed in a similar manner to the wall graduation, wherein the wall graduation is arranged in a longitudinal wall of the housing and the channel and the second channel are arranged in opposite transverse walls.
 25. Heat exchanger arrangement according to claim 23, wherein the second channel and the wall graduation are arranged adjacent to each other and together constitute the wall graduation of the housing.
 26. Heat exchanger arrangement according to claim 23, wherein the channel and the wall graduation are arranged away from each other. 